[SR-Users] kamailio loadbalancer with TLS problem forwarding INVITE back to UA

[Klaus Darilion]

make sure to also use 	handle_ruri_alias()
http://kamailio.org/docs/modules/4.0.x/modules/nathelper.html#idp16851488
for requests from the proxy->lb->client

see the default kamailio config for proper usage of handle_ruri_alias() 
and add_contact_alias()

regards
klaus


On 27.06.2013 02:34, Allen Zhang wrote:
> Hi,
>
> Our set up:
>
> UA1 -----
>                                                                          ------  Proxy1
>
>
>         \
>               /
>
>                         Loadbalancer (dispatcher module)
>
>                     /                                                                        \
>
> UA2-----
>                                                                                ------  Proxy2
>
> Both proxies have registrar module loaded and share the same database.
>
> REGISTERs work fine.
>
> The problem is this:
>
>                      TLS                                        TCP
>
> UA1  ----------------------> LB --------------------> Proxy
>
>              INVITE(to UA2)                  INVITE(to UA2)
>
>                    TLS                       TCP
>
> UA1  <------------- LB <------------- Proxy
>
>                                            100 Trying
>
>                    TLS                               TCP
>
> UA1  <------------- LB <----------------------- Proxy
>
>                                               INVITE(to UA2)
>
>                        TLS
>                            TCP
>
> UA1  <----------------------- LB <----------------------- Proxy
>
>                  100 Trying
>
> All above worked fine. Below is what’s expected but never happened:
>
>                        TLS
>                            TCP
>
> UA2  <----------------------- LB <----------------------- Proxy
>
>                  INVITE(to UA2)
>
> We’d like the LB to reuse the TLS connection initiated by UA2. But LB
> can’t find an open connection and tries to start a new TLS connection.
> The new connection fails.
>
> UAs are not behind NAT at the moment but will be in the future.
>
> Tried this approaches on LB:
>
> route(ADD_CONTACT_ALIAS);
>
> If (not from proxy)
>
>                  t_relay();
>
> else
>
>                  do load balancing
>
> No luck.
>
> Any help is appreciated.
>
> Regards,
>
> Allen
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>